单项选择题

When visibility is restricted（），we can say it is restricted visibility.

A.by long distance
B.by the darkness at night
C.by a vessel in front
D.by fog or falling snow

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单项选择题

When underway in a channel，you should keep to the（）.

A.Middle of the channel
B.Starboard side of the channel
C.Port side of the channel
D.Side of the channel that has the widest turns

单项选择题

When underway in a channel，you should if safe and practicable（）.

A.stay near the middle of the channel
B.keep to the starboard side of any vessels you meet
C.exchange whistle signals with any other vessels in the channel
D.keep to the side of the channel which lies to your starboard